A string of incidents related to Soyuz has raised concerns. Problems during a landing in April 2008 resulted in a dangerously steep re-entry trajectory.

联盟号飞船发生的一系列事故也让人感到担心。2008年四月着陆期间发生的问题导致它出现重返地球时的险情。

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The landing is thread connected with stop ring and tightened on and put into downhole with drill string. The landing sub is used as a sub above drill string before check valve is run in downhole.

就位接头与止动环用螺纹联结并上紧扣和钻柱连接下入井内，在未投入止回阀时作为钻柱上的一个接头。

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Burns' response was superb though and he took the fight to Martinez, playing the hard-hitting champion at his own game and landing a string of powerful shots throughout a gripping 12 rounds.

BBC: Ricky Burns takes world title from Roman Martinez